After an embarassing amount of hours reviewing, playing around with availability, and map studying and strategizing - here's what I came up with. I'm going in late August so won't be able to come back to confirm this worked but I'm analytical by profession (and nature) so fingers crossed. Note: I'm going during a historically slow time.
I'm not scheduling any FP before 10am, that's still a good time for standby lines at any time of year.
MK - Availability for additional FP in MK tends to be pretty good. Aside from the A&E, SDMT, parades, and some m&g. For that reason I'm planning my FP in the later morning hours and hoping for additional FP and minimal standby lines throughout the day. Regarding your MK selections, I would not use a FP for HM as part of my original 3. That's a must do for me but it's available throughout the day so you should be able to easily get it as a 4th if the standby line is long, although I like their queue. I also wouldn't hightail it out of Fantasy Land so early to get on HM @ 11 so even if you do want to reserve one for HM, make it for a little later in the day. Knock out Fantasy Land so you don't have to keep going back to it, circle your way around to each land. Make sure to review maps so you're comfortable with the layout of the rides and attractions you're interested in.
The other parks I'm spreading my FP out because of where I plan to be in which part of the day. Ex. Epcot, we're having lunch at Coral Reef so I figured we'll hit Soarin with FP, Nemo and Turtle Talk (standby) before lunch and before heading over to the world showcase where I'll use Maelstrom later in the day.
AK - spread out for the same reason as Epcot. Safari is best early in the morning but Kali River Rapids and EE are on the other side of the park so I'll make my way over there later.
HS - mostly together although between all the shows that have large capacity and the tiering, I can't even think of a 2nd non-tier 1 ride or attraction to FP. All the good stuff is tier 1.
Good luck!
IF I was going during a peak very busy time, I'd rope drop in the morning and use all my FP in the afternoon after lunch.